README: note on channels
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Installs [Nix](https://nixos.org/nix/) on GitHub Actions for the supported platforms: Linux and macOS.
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By default it has no channels configured, you have to set `nix_path`
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by [picking a channel](https://status.nixos.org/)
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or [pin nixpkgs yourself](https://nix.dev/tutorials/towards-reproducibility-pinning-nixpkgs.html).
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# Features
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- Quick installation (~4s on Linux, ~20s on macOS)
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